Dear all,
I'm puzzled by the behavior of stringHeight in the grid package.
Consider the following test,
library(grid)
test <- function(lab="dog", ...){
g1 <- textGrob(lab)
g2 <- rectGrob(height=grobHeight(g1), width=grobWidth(g1))
gg <- gTree(children=gList(g1,g2), ...)
print(c("height:", convertUnit(stringHeight(lab), "mm", "y")))
grid.draw(gg)
}
grid.newpage()
test()
test(expression(dog), vp=viewport(x=0.6))
## notice how the dog's tail is being cut off, where
## expression yields a snug cage
grid.newpage()
test("aoc")
test(expression(aoc), vp=viewport(x=0.6))
It appears that stringHeight correctly calculates the height for an
expression, but not for a basic string. I think it used to produce the
same output for both.
Best regards,
baptiste
sessionInfo()
R version 2.13.0 alpha (2011-03-27 r55076)
Platform: i386-apple-darwin9.8.0 (32-bit)
locale:
[1] C
attached base packages:
[1] stats graphics grDevices utils datasets grid methods
[8] base
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